Gateway destinations (#21040)

* Gateway generation

* Gateway stuff

* gatewehs

* mercenaries

* play area

* Range fixes and tweaks

* weh

* Gateway UI polish

* Lots of fixes

* Knock some items off

* Fix dungeon spawning

Realistically we should probably be using a salvage job.

* wahwah

* wehvs

* expression

* weh

* eee

* a

* a

* WEH

* frfr

* Gatwey

* Fix gateway windows

* Fix gateway windows

* a

* a

* Better layer masking

* a

* a

* Noise fixes

* a

* Fix fractal calculations

* a

* More fixes

* Fixes

* Add layers back in

* Fixes

* namespaces and ftl

* Other TODO

* Fix distance

* Cleanup

* Fix test

Content.Shared/Procedural/Loot/BiomeMarkerLoot.cs

@@ -1,4 +1,5 @@
 using Content.Shared.Parallax.Biomes.Markers;
+using Robust.Shared.Prototypes;
 using Robust.Shared.Serialization.TypeSerializers.Implementations.Custom.Prototype;
 using Robust.Shared.Serialization.TypeSerializers.Implementations.Custom.Prototype.Dictionary;
 
@@ -9,7 +10,6 @@ namespace Content.Shared.Procedural.Loot;
 /// </summary>
 public sealed partial class BiomeMarkerLoot : IDungeonLoot
 {
-    [DataField("proto", required: true,
-        customTypeSerializer: typeof(PrototypeIdValueDictionarySerializer<string, BiomeMarkerLayerPrototype>))]
-    public Dictionary<string, string> Prototype = new();
+    [DataField("proto", required: true)]
+    public ProtoId<BiomeMarkerLayerPrototype> Prototype = new();
 }